Free Dictionary Org is an English Dictionary that gives you English definitions, synonyms, pronunciation, spelling and more. It gives suggestions if you spell a word wrong.
· FREE
· Suggest words while you are typing.
· Improve your language skills...

Vietnamese Dictionary - This extension enables spell checking in Vietnamese. It includes two dictionaries: one for new-style diacritics, and one for old-style diacritics. · Added support for the latest betas of Firefox 4 and compatible applications. · Added a few correctly-spelled words to the word lists and removed a misspelled word.
What's New in This Release:
· Added support for the latest betas of Firefox 4 and compatible applications...

Yiddish spell checker - Spellchecking dictionary for Yiddish language. Contains entries in standard YIVO orthography and is compatible with the previously developed specification, which assumes not using typographic ligatures in the simple text because of their special functions...